Heterogeneity of Organoclay Complexes in Shale Regulates the Generation of Shale Oil.

Organic matter (OM) and clay minerals are important components in shale, which are intimately associated with each other in the form of organoclay complexes. The diverse mineral-OM associations result in varying OM occurrences, which possess distinct hydrocarbon generation potential and ultimately affect the accumulation of shale oil. Therefore, the investigation of the heterogeneity of organoclay complexes is crucial to gaining a comprehensive understanding of the varying exploration potential of shale oil resources.

Vesicle Hydrogels Formed from the Perfluorononanoic Acid/Tetradecyl Dimethylaminoxide Oxide System.

Vesicle hydrogels are supramolecular structures formed by the self-assembly of surfactant molecules in solution, which have great application prospects. The phase behavior of perfluorononanoic acid (CFCOOH) and an amphoteric hydrocarbon surfactant, tetradecyl dimethylaminoxide (CDMAO), in an aqueous solution has been studied. By changing the mixing ratio and concentration of CFCOOH and CDMAO, the phase diagram of the system was drawn, and interestingly, a hydrogel composed of polyhedral and spherical vesicles was successfully constructed.

Experimental Investigation on Layer Subdivision Water Injection in Multilayer Heterogeneous Reservoirs.

Layer subdivision is currently one of the principal techniques employed to solve interlayer contradictions during water injection in multilayer heterogeneous reservoirs, but experimental research on the mechanism and the corresponding implementation plans is lacking. In this study, a multilayer heterogeneous core model was designed, and physical simulation experiments with different subdivisions and variation coefficients were conducted. Furthermore, the influence of the subdivision degree on the water injection development effect was analyzed, and the dynamic characteristics of the oil displacement of each sublayer were compared.

Pore Structure Characteristics and Controlling Factors of a Tight Sandstone Reservoir in the Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin, China.

Tight sandstone reservoirs have ultralow physical properties and strong heterogeneity, and there is a need to describe the corresponding pore structure characteristics systematically to promote research on unconventional reservoirs. The pore structure, controlled by the diagenesis and volcanic activity of the tight reservoirs in the third member of the Shahejie Formation (Es) of the Gaoshangpu structural belt in the Nanpu Sag, is studied by high-pressure mercury injection, nuclear magnetic resonance, and constant-rate-controlled mercury porosimetry. The results show that the Es reservoir can be divided into three types: the pore radii of Type I reservoirs range from 120 to 180 μm, and the throat radii are larger than 1 μm, resulting in good pore connectivity; pore radii of Type II reservoirs are approximately 100 μm, and the throat radii range from 0.

Energy Conservation and Carbon Flux Distribution During Fermentation of CO or H/CO by .

Both CO and H can be utilized as energy sources during the autotrophic growth of . In principle, CO is a more energetically and thermodynamically favorable energy source for gas fermentation in comparison to H. Therefore, metabolism may vary during growth under different energy sources.

Unveiling the signals from extremely noisy microseismic data for high-resolution hydraulic fracturing monitoring.

Microseismic method is an essential technique for monitoring the dynamic status of hydraulic fracturing during the development of unconventional reservoirs. However, one of the challenges in microseismic monitoring is that those seismic signals generated from micro seismicity have extremely low amplitude. We develop a methodology to unveil the signals that are smeared in the strong ambient noise and thus facilitate a more accurate arrival-time picking that will ultimately improve the localization accuracy.